Power-transmitting mechanism.



A. SUNDH. POWER TRANSMITTING MBGHANISM.

APPLICATION FILED PEB. 23. 1911.

Patented Dee. 5, 1911.

uNrrED sTATEs PATENT orrion.

AUGUST SUNDH, 0F HASTINGS, NEW YORK, ASSIGNOR 'E0 OTIS- ELEVA'IORCOMPANY, l 0F JERSEY CITY, NEW JERSEY, A CORBQRATION QF NEWSpecification of Letters Patent.

Application led February 23, .1911, Serial No. 610,232.

To all whom it may concern:

Be it known that l, AUGUST SUNDH, a citizen of the United States,residing at Hastings, in the county of Westchester and State of NewYork, have invented a new and useful Improvement in Power-TransmittingMechanism, of which the following is a specification. p

My invention relates to mechanism for transmitting power between adriving mem- -cally silent even whenthe gears are running at a highspeed.

In the engineering art various forms of mechanism have been employed toeffect' a 'reduction or increase in p speed of power driven mechanism.For example in the elevator art the use of noiseless chains, worm gears,friction driving belts, and spur gears, are all well known. I have foundin practice that a noiseless chain runs well but may break and cannot bedepended on; worm gears give a low efficiency and the relative speedobtained by their use is confined with'- in comparatively narrow limits;friction driving mechanism is unsatisfactory largely on account of therapid wear; leather belting moreover can only be used where ample spaceis available and where a positive driving connection is not essential;spur gears form practically a positive driving connection and` give ahigh eiiciency if properly designed and arranged and have the advanta gcthat the speed maybe varied to any desired degree. The principalobjection to this form of gearing -as in common use is the excessivenoise especially where the machincryv is run at a high speed. l

The present invent-ion aims tov overcome the objectionable featuresabove noted and to provide a form of mechanism in which 'i spur gearsmay be employed and at the same time a smooth drive obtained and the0bspecific objects sought to -be obtained will appear more fullyhereinafter.

Figure 1 is a part sectional elevation of power transmitting mechanismconstructed in accordance withthe principles of my invention; Fig. 2 isa sectional view as indi cated by the line'2-2 of Fig. 1.

' As herein shown an electric motor M is employed as a source of power.The motor shaft 1 is connected through intermediate gearing presently tobe described to 4a driven vshaft 2 on which is mounted a traction sheaveor drum T. The shaft 2 is journaled in 'a bearing 3 carried by astandard 4. The latter and also the motor M are mounted on a suitablebase or bedplate B. Keyed to the drive shaft 1 is a series of spur gears5 placed side by side on the shaft, and arranged with their gear teethin staggered relation. In this instance three such gears are shown,although any other suitable number might be employed. The inner end ofthe shaft-2 is provided with a head 6 substantially in the form of adisk and to which are secured bearing shafts 7. On each of the shafts 7is mounted a series of spur gears 8 in mesh with the gears 5. Theopposite ends of the bearing shafts 7 are connected to a ring 8. Thelatter may be held rigid with .respect to the head 6 by means oftie-rods or` bolts 9.

Surrounding the gears 5 and in mesh therewith is a series of stationaryannular spur gears 10. -The annular gears 10 are suitably secured withinthe casing comprising sections C and C. The section C is secured to themotor frame by means of bolts 11 and the two sections ofthe casing areconnected by means of bolts 12. The casing 'is made hollow and providedwith suitable compartments to receive the packing of sound'fdeadeningmaterial 13 which may be any suitable material, such .as saw dust,asbestos-ber, or the like, which will absorb the sound vibrations andprevent the sound being transmitted from the gearing. The section C ofthe casing comprises a compartment 14 which is closed by an end plate 15and an annular compartment 16 which surrounds thc gearing and may beclosed by a ring Patented Dee. 5, 191.1.,

jectionable noise of such gears practically Referring to theaccompanying drawing, i

17. The section C is formed with a compartment 18 closed by an annularplate 19. Each of the said compartments is packed with a suitablematerial as above indicated. The ball vbearings 20 are interposedbetween the section C of the casing and the driven shaft 2. Ballbearings 21 are likewise provided between the ring 8 and the-hub of thesection C. Interposed between theannular gears 10 and the casing is aring 22 consisting of some suitable non-resonant lor sound-deadeningmaterial, such as metallic lead. rIhis material 22 forms a convenientand practical means for securing the annular gears to the casing and atthe same time preventing sound vibrations being transmitted from thegears to the casing, that is, it forms an auxiliary means in connectionwith the casing for reducing the noise.

I am aware that spur gears have been arranged in staggered relation invarious forms of mechanism. I am aware also that the use ofsound-deadening material for reducing the vibrations and noise .of powertransmitting mechanism is common, especially as placed underneath andforming a support for the mechanism. I do not therefore claim broadlythe use eitherof such material in connection with power transmittingmechanism or the use broadly of gears having their gear teeth instaggered relation. The particular arrangement of the gearing however,and also the use in connection with such gearing of the surroundingcasing with the packing of sound-deadening material all asset forth inthe appended claims I believe to be new. p

I have found by experiment with the mechanism herein disclosed that anew result is obtained, namely thatthe objectionable noise ispractically eliminated and at the same time a smooth operation secured.

It will be understood that the driving elements may be connected to anysuitable source ot power, an electric motor-'being 1 shown merely as anexample ot a suitable power device. 'Ihe driven element 2 may also beconnected to operate any desired mechanism. Various changes in thedetails and arrangement ct parts might also be madewithin the scope ofthe invention. wish therefore not to be limited to the exactconstruction disclosed.

WVhat I claim as new and desire to secure by Letters Patent of theUnited States is z- 1. In power transmitting mechanism, the combinationof a driving member, and a driven member, intermeshing spur gearsconnected to said members, a stationary annular spur gear surroundingand coperating with sald first-named gears, a double- `walled casinginclpsing the gears, sounddeadening material forming a packing betweenthe walls of the casing, and a nonresonantmaterial interposed betweenthe annular gear and the casing.

2. In power transmitting mechanism, the combination of gears, bearingsfor the gears, a double-'Walled casing inclosing said gears, andsound-deadening material interposed between the walls of said casing.

3. In power transmission mechanism, the combination of intermeshing spurgears and a sound proof casing inclosing said gears, said casingcomprising double walls made in sections, and sound deadening materialbetween the walls.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

AUGUST SUNDH.

Witnesses:

JOHN F. RULE, J'AMns G. BETHELL.

